almost all of Leibniz's work in logic remained … readily available. Thus, if one begins to trace … logic must go to Boole, Frege, Peano, and … [footnote: Boole may have seen Erdmann's edition of Non Inelegans Specimen Demonstrandi in Abstractis; Gottfried Martin, 1964 notes that New Essays (1795) and Theodicy (1840) indicate Leibniz's aims in logic.]
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